Circuit-breaker.



Non 837,023.

1m' BREAKER.

APPLXUATIOE P1 LED JAN. l1. 1904` Wi ffies ses UNITED STATES PATENT OFFICE.

GILBERT WRIGHT, OF PITTSFIELD, MASSACHUSETTS, ASSIGNOR TO STANLEY ELECTRIC MANUFACTURING COMPANY, OF PITTSFIELD, MASSACHUSETTS, A CORPORATION OF NEW JERSEY.

CIRCUIT-BREAKER.

Specification of Letters Patent.

Patented Nov. 27, 1906.

Application filed January 11,1904. Serial No. 188,519.

To all whom, it may concern:

Be it known that I, GILBERT Winer-1r, a citizen of the United States, residing at Pittsfield, in the county of Berkshire and State of Massachusetts, have invented certain new and useful Improvements in Circuit-Breakers, of which the following is a speciiication.

My invention relates to automatic switches or breakers for electric circuits, and the object of my invention is to provide a tripping device for such breakers which shall be more compact and more economical both in respect to materials and in respect to consumption of energy than tripping devices as heretofore constructed and which 4shall be positive and ellicient in action, operating with a quick hammer-blow to release the breaker.

My invention will be best understood by reference to the accompanying drawings, in which" Figure 1 shows a switch and tripping device arranged in accordance with my invention, and Fig. 2 shows diagrammatically the circuits of the same.

In the drawings, A represents a switch mounted on the base B` and engaging when closed the stationary contacts a c.

Although for the sake of simplicity I have shown switch A as a simple knife-blade switch, it will be understood that my invention is in no way limited to this type, but is applicable to any well-known type of switch.

C "is a spring tending to open switch A, and I) is a catch or latch normally restraining switch A in its closed position againstI the tension oi" s ring C. i

E is asolbnoid having a compound winding, as shown in Fig. 2, consisting of the Wind* ing e, which is ot' com aratively large wire and few turns/and Winding e, which consists of comparatively iine wire and many turns.

F is the movable core of solenoid E. Core F carries bridging memb'er j, which when core F is in its normal osition bridges the stationary contacts g. ridging member F thus normally short-circuits thc fine-wire coil e', which is thus cut out of circuit, as is shown inv Fig. 2. The consumption of energy in the solenoid is consequently very small, since only the large-wire coil e of few turns is normally in circuit. When a predetermined overload occurs, however, coil e raises core F, lifting bridging member f from contact g. The short circuit is consequently removed from the winding e, which is thereby thrown into series withfthe winding e. The ampere-turns of the breaker are thus instantly increased, the pull .upon core F increases, and core F moves up quickly, driving the movable member d with. a hammerblow against the latch I). It will be seen that winding e is in circuit only instantaneously, and consequently may be made of much smaller wire than would be necessary in a coll which is all the time in circuit. Consequently the solenoid may be much smaller than a solenoid designed to give a hammerblow of the same strength, but whose winding is all the time in circuit.

I do not desire to limit myselr` to the particular construction and arrangement of parts hereshown, since changes therein which do not depart from the spirit of my invention and which are within the scope of the appended claims will be obvious to those skilled in the art.

That I claim as new, and desire to securev by Letters Patent of the United States, is

lgreater number of turns than the other, a

movable core controlled by said. windings, a member actuated by said core and arranged to short-circuit the magnet-winding of the greater number of turns when said core is in its normal position, and a circuit-breaker tripped by the movement of said core to open said circuit.

3. In combination with a circuit to be protected, two magnet-windings in series with said circuit, one of said windings being of smaller wire than the other, a movable core controlled by said windings, a member actuated by said core and arranged to short-circuit the Winding ol smaller wire when said IOO rot,

core is in its normal position, and efleireuitbreaker tripped by the rnovernen'fy of seid core to open said Circuit.

4. In combination with e eireuit to be .pro heated, two nmgnet-windings in series with said circuit, :L movable core controlled by Suid windings, means normally short-Circuiting one of said windings, means for removing /he short circuit upon the flow of :L predetermined` current 4in said Circuit, pull upon said core is increased, and le cir enit-breaker tripped by the moveinen of said eore to open said circuit.

5. In eornbmation Withe-circuit to-.be-preteeted, two magnet-windings inserles with;

said. circuit, one of said.

windings having greater number of turns than the oaher, .e

whereby abhemovable core conirolled by seid windings, ineens for normally short eireuioing "She Wmdingheving tliegreeer number or earns, operative conneeons berm/een seid core and said shortmireuiting means for removing said Sherri circuit when seid core begins to move, whereby the effective ampere-turns acting on seid eore ere increased, and e swieli ermovement of said core and adapted open seid circuit.

In Witness Wliereo' lieve hereunto set my hand this 'bbiday ofJenuery, 004-.

ranged to be operated by "he continued AGS S SS I Meriem LEGNARD 

